96 lines
2.4 KiB
Java
96 lines
2.4 KiB
Java
// Program to merge two sorted arrays without any extra space in Java
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/*
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Author : Suraj Kumar Modi
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Github : https://github.com/skmodi649
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*/
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/** Algorithm :
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* 1) Initialize i,j as n-1,0 where n is size of arr1
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* 2) Iterate through every element of arr1 and arr2 using two pointers i and j respectively
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* while(i>=0 && j<m)
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* if arr1[i] is more than arr2[j]
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* swap arr1[i] and arr2[j]
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* else
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* decrement i
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* increment j
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*
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* 3) Sort both arr1 and arr2
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*/
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import java.util.*;
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class MergingWithoutExtraSpace {
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// Driver code
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public static void main(String[] args) {
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Scanner sc = new Scanner(System.in);
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System.out.println("Enter the sizes of arr1 and arr2 respectively : ");
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int n = sc.nextInt();
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int m = sc.nextInt();
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int[] arr1 = new int[n];
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int[] arr2 = new int[m];
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System.out.println("Enter elements in the arr1 : ");
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for (int i = 0; i < n; i++) {
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arr1[i] = sc.nextInt();
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}
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System.out.println("Enter elements in the arr2 : ");
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for (int i = 0; i < m; i++) {
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arr2[i] = sc.nextInt();
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}
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System.out.println("Merged array : ");
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MergingWithoutExtraSpace ob = new MergingWithoutExtraSpace();
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ob.merge(arr1 , arr2 , n , m);
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StringBuffer str = new StringBuffer();
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for (int i = 0; i < n; i++) {
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str.append(arr1[i]).append(" ");
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}
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for (int i = 0; i < m; i++) {
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str.append(arr2[i]).append(" ");
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}
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System.out.println(str);
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}
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public void merge(int[] arr1, int[] arr2, int n, int m) {
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int i = n-1 , j = 0;
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while(i>=0 && j<m)
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{
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if(arr1[i] > arr2[j])
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{
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int temp = arr1[i];
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arr1[i] = arr2[j];
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arr2[j] = temp;
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}
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i--;
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j++;
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}
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Arrays.sort(arr1);
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Arrays.sort(arr2);
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}
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}
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/** TEST CASES :
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*
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* Test Case 1 :
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* Input : n = 3 , m = 4
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* arr1[] = {1,27,36} arr2[] = {12,14,16,22}
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* Output :
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* 1 12 14 16 22 27 36
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*
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* Test Case 2 :
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* Input : n = 4 , m = 5
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* arr1[] = {0,12,21,27} arr2[] = {4,6,8,10,12}
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* Output :
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* 0 4 6 8 10 12 12 21 27
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*/
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/**
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* Time Complexity : O((n+m)log(n+m))
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* Auxiliary Space Complexity : O(1)
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*/
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